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In the film, Johner says, "Earth? I'm not going to that fucking slum."
A deleted final scene actually shows us the state of the planet - and it doesn't look pretty. It would appear that a cataclysmic event has left the planet a barren wasteland.
I, too, would be reluctant to return to Earth.
Deleted Scene from Alien Resurrection

I believe that they blew up the ship ultimately to stop the possibility of an alien infestation from occurring on earth. This has always been Ripley's mission in the previous films...therefore her Human half took over in the end.